DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1757
Date of introduction: | 1981 | Display technology: | LCD |
New price: | Display size: | 8 | |
Size: | 4.0" x 2.4" x 0.25" 101 x 61 x 6.5 mm³ |
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Weight: | 1.7 ounces, 48 grams | Serial No: | 7468115 |
Batteries: | 2*LR54 | Date of manufacture: | 1983 |
AC-Adapter: | Origin of manufacture: | Taiwan | |
Precision: | 8 | Integrated circuits: | Sharp LI3321 |
Memories: | 1 | ||
Program steps: | Courtesy of: | Fabrizio Corpetti | |
Download manual: |
(EU: 2.8M Bytes) (EU: 1.3M Bytes) |
The
TI-1757 "Melody Card" added to the similar TI-1755
the capabilities to play own melodies or store up to 8 notes in its memory. This
TI-1757 was soon replaced with the TI-1757 II
"Melody Calculator", adding more music in the same package.
Dismantling this TI-1757
manufactured in or around 1982 by a non-disclosed OEM (Original Equipment
Manufacturer) in Taiwan reveals a clean design centered around a Sharp
LI3321 single-chip calculator circuit soldered on a double-sided printed circuit board
(PCB) and powered by two LR54 (LR1130) batteries.
Inspecting the PCB
of this TI-1757 calculator brought our attention to a small mark reading
ML61-2,
we spotted a similar PCB-Mark MK65-A already with the TI-1755
and its twin
TI-1756. We are almost positive that
the TI-1757 was manufactured by
Inventa Electronics Corporation
of Taipei, Taiwan. We started compiling a list
of the PCB-Marks on calculators
manufactured by OEMs for Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, November 25, 2022. No reprints without written permission.